Coolant to grinding wheels



May 17, 1955 v. E. RIDDELL ErAL 2,708,332

COOLANT TO GRINDING WHEELS Filed Feb. 10, 1951 INVENTOR5 VERA/01V 5. Hana L (HA/71.5; M 81/ M255 ATTORNE United States Patent COOLANT T0 GRINDING WHEELS "ernon E. Riddell and Charles M. Buttiger, Detroit, Mich assignors to Vinco Corporation, Detroit, Micln, a corporation of Michigan Application February 11), 1951, Serial No. 210,382

1 Claim. (Cl. 51-267) This invention relates to grinding wheels and more particularly to the structure of the wheel mounting whereby the coolant is applied to the grinding surface through the wheel itself in such manner that the centrifugal force resulting from the rotation of the wheel maintains an even distribution of the coolant throughout the wheel.

A further object of the invention is to provide a structure wherein the quantity of coolant absorbed by the wheel may be readily regulated as may be desired for different grinding operations.

A further object of the invention is to provide a structure wherein the mounting which serves to feed the coolant to the wheel also serves to maintain the wheel accurately centered with respect to its axis of rotation while permitting the wheel to be readily removed for substitution of diiferent wheels of dififerent composition, as i may be required for different grinding operations.

in the accompanyinmdrawings we have illustrated a preferred embodiment of our invention, and in the said drawings, a

Figure l is a vertical sectional view in the plane of the axis of rotation of the wheel;

Fig. 2 is an end view of the mounting member for the grinding wheel with the wheel and clamping member removed;

Fig. 3 is a detail view of the clamping washers interposed between the wheel and the mounting members;

Fig. 4 is a sectional view on line 4-4 of Fig. l; and

Fig. 5 is a similar view on line 5-5 of Fig. 1.

Referring to the drawings, 1 indicates the shaft or spindle for the grinding wheel 2. Keyed on the shaft 1 is a mounting member 3 comprising a hub portion 3' on which the wheel 2 is accurately centered by means of a lead bushing 4'. The member 3 has a flanged portion 5 which serves as a reservoir for the coolant, and also serves to distribute the coolant uniformly to the adjacent surface of the wheel.

As shown in Fig. 2 the face of the flange 5 is formed with a groove 6 and connecting with the groove 6 are a plurality of spaced holes 7 leading to an annular chamber or recess 8 in the outer face of the member 5 which extends diagonally outwardly towards the grindstone and away from the axis of the wheel.

As will be noted from Fig. 1, the outer wall of the recess 8 and the holes 7 are inclined outwardly from the axis of rotation, so that under the influence of centrifugal force the liquid coolant delivered to the recess 8 will be retained in the recess and the holes 7 until absorbed by the wheel 2.

The wheel 2 is clamped between the flange 5 and clamping member 4. This member is provided with holes 9 similar to the holes 7 and with an annular chamber or recess 10 which extends diagonally towards the grindstone and away from the axis of the wheel and which is similar to the recess 8, so that the coolant delivered to the member 4 will likewise be carried by the centrifugal force against the surface of the wheel 2 so as to be absorbed by the wheel and carried outwardly to the peice riphery of the wheel to serve as a coolant for the contacting surfaces of the abrasive and the article being ground.

The hub of the member 4 is threaded to screw onto the hub 3 of the member 3 and thereby clamp the wheel 2 in proper position concentric with the axis of rotation. The member 5 is locked against rotation by keys 11 inserted in suitable keyways in the parts 4 and 5. The mounting member 3 is clamped to the shaft 1 by a nut Washers 13, as shown in Fig. l, are inserted between the sides of the wheel 2 and the clamping faces of the parts 3 and 4. The washers 13 are provided with arcuate slots which register with the holes 7 and 9 so as to permit free passage of the coolant from the reservoirs 8 and .1 10 to the surface of the wheel.

The coolant, which may be water or a mixture of water with oil, is delivered to the chambers 8 and 10 by pipes 14. In Fig. 1 I have shown the liquid level in chambers 8 and 10 as sufficient to submerge the holes 7 and 9 in parts 3 and 4, respectively. The amount of coolant delivered to the pipes 14 is metered so as to maintain the desired amount of coolant in the chambers 8 and 18 and if these chambers are maintained full of coolant the maximum amount of coolant that the wheel will absorb is available. However, a lesser amount of coolant may be delivered to the wheel where the particular grinding operation requires it. When a lesser amount of coolant is delivered by the pipes 14 the level of the liquid in the chambers 8 and 10 will be such that the holes 7 and 9 will not be fully submerged in the liquid. Consequently smaller areas of the faces of the wheel will be wet by the coolant and the rate of absorption will be less. By metering the liquid delivered by the pipes 14 the degree of wetness of the wheel may be exactly controlled.

Some grinding operations are better carried out as dry grinding according to the present practice, While other operations are better carried out as wet grinding. No attempt has heretofore been made to maintain an intermediate condition between dry grinding when no coolant is applied to the wheel, and wet grinding when the wheel is covered with as much liquid as the adhesion of the liquid to the wheel will permit. By the apparatus of this application we are able to supply any degree of wetness between a fully saturated wheel and a dry wheel, thereby providing for refinements in grinding operations not heretofore obtainable.

In the appended claims 1 have used the word coolant to designate the liquid delivered to the wheel, but it will be understood that the invention is not limited to any particular liquid and the claims cover the structure recited regardless of its use.

We claim:

A grinding Wheel assembly comprising a shaft, a bushing keyed to said shaft, said bushing having an integral radially extending flange, a grindstone seated on said bushing, a clamping member threaded on said bushing for clamping said grindstone against said flange, an annular chamber formed in the outer surface of the bushing flange, said chamber extending diagonally towards the grindstone and away from the axis of the wheel, an annular series of holes extending diagonally outwardly from the bottom of the chamber through the opposite wall of said flange, said clamping member having an annular chamber formed in its outer face, said last-named chamber extending diagonally towards the grindstone and away from the axis of the wheel, an annular series of holes extending diagonally outward from the bottom of the last-named chamber through the opposite wall of the clamping member, and washers interposed between the opposite faces of said grindstone and said flange and clamping member, respectively, said washers having arcuate slots registering with the annular series of holes 1,947,662 Robinson Feb. 20, 1934 in said flange and clamping member. 2,259,345 Kuzmick et a1 Oct. 14, 1941 2,388,697 Lombard Nov. 13, 1945 References (Iited in the file of this patent 2 470 350 Harrington May 17 1949 UNITED STATES PATENTS 5 2,572,042 Martin Oct. 23, 1951 376,854 Cavert Jan. 24, 1888 FOREIGN PATENTS 500,561 Carpenter July 4,1893 500,485 Germany Jan. 23, 1929 813,348 Sanford-Burton Feb. 20, 1906 

